/**
 * astroengine ephemeris -- a time series of one value per body over a range, the
 * data behind a graphic ephemeris. A thin collector over the validated
 * positions (longitude, latitude, declination, right ascension, or speed), so
 * there is no new math here; the underlying values are the ones the conformance
 * suite already pins. Pair it with caelus-wheel's EphemerisGraph to draw it.
 */
import { Engine, BodyId, Zodiac } from "./chart.js";
export type EphemerisValue = "longitude" | "latitude" | "declination" | "rightAscension" | "speed";
export interface EphemerisOptions {
    /** First instant, UT Julian Day (inclusive). */
    start: number;
    /** Last instant, UT Julian Day (inclusive). */
    end: number;
    /** Spacing between samples, days. Must be positive. */
    step: number;
    /** Which quantity to sample (default longitude). */
    value?: EphemerisValue;
    zodiac?: Zodiac;
}
export interface EphemerisPoint {
    jd: number;
    value: number;
}
/** Sample `value` for each body across [start, end], returning per-body series
 *  in time order. */
export declare function ephemeris(engine: Engine, bodies: BodyId[], opts: EphemerisOptions): Record<string, EphemerisPoint[]>;